End-to-End development for GPS tracking app

We are looking to build: A child safety GPS tracking platform built for caregivers of children with autism and special needs. Off the shelf tracking hardware will be used and you will be building the software. (No custom firmware) - 📍 **Real-time location tracking** on an animated live map - 🚨 **Elopement alerts** — push + SMS within x seconds of a child leaving a safe zone - 🎙️ **Two-way voice** — caregiver talks to or listens in on the child through the device, directly from the app - 🏠 **Indoor positioning** — via WiFi / BLE beacons - 📡 **Proximity Mode** — dynamic safety radius around the caregiver's location; alerts if the child wanders too far (ideal for parks, fairs, public spaces) - 🏫 **Teacher Mode** — school staff can schedule a voice-disable window on the device during class hours, optionally locked to the school geofence; parents can override at any time - 💳 **Subscriptions + hardware store** — Stripe billing, Shopify device sales, affiliate program --- ## What We Need Built | Deliverable | Details | |-------------|---------| | **iOS + Android App** | React Native (Expo) — live map, alerts, voice, geofence drawing, proximity mode | | **Web Dashboard** | Next.js 15 — full feature parity for browser-based caregivers | | **Backend API** | Node.js + TypeScript + Fastify — geofence engine, alert pipeline, voice, billing | | **Device Gateway** | Traccar (self-hosted) — translates Eview hardware protocol; no custom firmware | | **Admin Panel** | Retool — account management, device/firmware, billing, support | | **E-Commerce** | Shopify store for hardware bundles + Stripe subscription plans | --- ## Tech Stack React Native (Expo) · Next.js 15 · Node.js/TypeScript · Supabase/PostGIS · Traccar · Ably · Twilio Voice · OneSignal · Clerk · Stripe · Shopify · Mapbox · Google Maps · PostHog · Railway · Vercel · Expo EAS --- ## Skills Required A complete, self-sufficient team including: - Backend Engineers (Node.js, PostGIS, Twilio, Traccar) - Mobile Engineer (React Native/Expo, Twilio Voice SDK) - Frontend Engineer (Next.js, Mapbox) - DevOps / Infra (Railway, Vercel, Fly.io, GitHub Actions) - Project Manager **Must have:** prior App Store + Google Play shipping experience; IoT/GPS integration experience; compliance-sensitive app experience (COPPA/HIPAA or equivalent). --- ## Scope at a Glance - **Duration:** ~(3 months) - **Scale target:** production-ready for 10,000 users at launch - **Testing:** unit, integration, E2E, and K6 load tests all required deliverables - **Compliance:** COPPA + PIPEDA + external penetration test required - **Handover:** live App Store apps, deployed infrastructure, full documentation, 2-months post-launch hypercare --- ## This Is a Fixed-Fee Project We are not accepting hourly or T&M proposals. Your proposal must include a fixed total price. with an additional hourly rate for extra work if it should come up. --- ## Interested? Please tell me about you or your team. Your relevant experience and why you feel you would be the right candidate for the project.